Consolidated Statements of Operations (Parenthetical) (USD $) In Thousands, unless otherwise specified	4 Months Ended	12 Months Ended
Dec. 31, 2009	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements of Operations
Management fees, non-cash stock-based compensation	$ 2,393	$ 13,493	$ 7,420
General and administrative, non-cash stock-based compensation	28	250	102
Non-credit impairment charges		$ 1,310

The amount of expense reported during the period resulting from the transaction in which equity securities were issued to pay for goods or nonemployee services.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 65

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 50

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Name:	us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration